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Essential October 2025 Tax Deadlines for Businesses

As the vibrant colors of fall emerge, businesses must remain vigilant about crucial tax deadlines that October brings. From filing corporate returns to complying with payroll tax obligations, it's imperative to keep these dates in mind to ensure compliance and avoid potential penalties. Here, we detail the key deadlines that businesses need to address in October 2025.

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October 15 - Corporate Tax Filings

Businesses operating on a calendar year must file their 2024 income tax return (Form 1120) by October 15 if they secured an automatic 6-month extension by the previous April. It's critical to settle any taxes, interest, and penalties that may be due by this date to avoid lapses in compliance.

October 15 - Employment Tax Deposits

Employers required to follow the monthly deposit schedule must submit their taxes for Social Security, Medicare, and withheld income tax for September 2025 on or before October 15. The same applies for nonpayroll withholdings, depending on the applicability of the deposit rules.

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October 15 - Establish a Keogh Plan

If you’ve received a filing extension for your 2023 tax return and are self-employed, October 15, 2025, is the final day to establish a Keogh Retirement Account, should you intend to make contributions for the 2024 tax year.

October 15 - SEP IRA & Keogh Contributions

This deadline also marks the cut-off for making contributions to SEP IRAs and Keogh plans for the 2024 tax year if your tax return extension is valid through October 15.

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October 31 - Quarterly Tax Filings

October wraps up with the necessity to file Form 941 for the third quarter. Ensuring all taxes are deposited under the accuracy of deposit rules is crucial. For liabilities under $2,500, the tax can be paid in full with the return. Should deposits be timely and complete, the deadline extends to November 10, providing some additional breathing room.

October 31 - Small Employers and FUTA

For smaller employers, if the annual tax liability is at least $2,500, but the third quarter liability is under this threshold, any remaining taxes must be deposited by this date. Additionally, businesses must deposit their Federal Unemployment Tax (FUTA) for amounts exceeding $500 through September.

Handling Weekends and Holidays

Remember, if any deadline falls on a weekend or legal holiday, the due date automatically extends to the next business day that isn’t a legal holiday.

Extensions Due to Disasters

In instances where a geographical area is declared a disaster zone, filing and payment due dates may be extended. Stay informed by visiting FEMA and the IRS’s Tax Relief in Disaster Situations pages for updates and applicable deadlines.

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